| ENERGY STAR Partner |
| Bosch Thermotechnology Corporation |
Bosch Thermotechnology Corporation |
| Brand Name |
| Bosch |
Bosch |
| Model Name |
| Greenstar |
Greenstar FS |
| Model Number |
| ZWB 42-3 |
KWB 28-3 |
| Type |
| Boiler |
Boiler |
| Fuel Type |
| Natural Gas,Propane Gas |
Natural Gas,Propane Gas |
| Efficiency (AFUE) |
| 95 |
95 |
| Date Available On Market |
| April 1, 2010 |
April 1, 2015 |
| Date Qualified |
| November 8, 2021 |
November 8, 2021 |
| Markets |
| United States, Canada |
United States, Canada |
| CB Model Identifier |
| ES_16809_ZWB 42-3_03262018141829_2898687 |
ES_16809_KWB 28-3_03262018141834_9855853 |
| Can Integrate Hot Water Heating |
| Yes |
Yes |
| Product Category |
| Boilers |
Boilers |
| Date Certified |
| November 8, 2021 |
November 8, 2021 |
| Meets ENERGY STAR Most Efficient 2024 Criteria |
| No |
No |
